AngularJS:指令无法访问隔离范围对象 [英] AngularJS : Directive not able to access isolate scope objects

问题描述

我正在尝试在具有 Isolate 作用域的指令中添加一些默认值.基本上，当我的指令被绑定时，我需要使用范围对象进行一些 DOM 操作.下面是我的代码:

I am trying to put some default values in my directive with Isolate scope. Basically, I need to do some DOM manipulations using the scope object when my directive is bound. Below is my code:

控制器:

angular.module('ctrl').controller('TempCtrl', function($scope, $location, $window, $timeout, RestService, CommonSerivce) {

$scope.showAppEditWindow = function() {
    //Binding the directive isolate scope objects with parent scope objects
    $scope.asAppObj = $scope.appObj;
    $scope.asAppSubs = $scope.appSubscriptions;

    //Making Initial Settings
    CommonSerivce.broadcastFunction('doDirectiveBroadcast', "");
};

服务:

angular.module('Services').factory('CommonSerivce', function ($rootScope) {
return {       
    broadcastFunction: function(listener, args) {
        $rootScope.$broadcast(listener, args);
    }
};

指令:

angular.module('directives').directive('tempDirective', function() {
return {
    restrict : 'E',
    scope:{
        appObj:'=asAppObj',
        appSubs: '=asAppSubs'
    },
    link : function(scope, element, attrs) {},
    controller : function ($scope,Services,CommonSerivce) {         
        //Broadcast Listener 
        $scope.$on('doDirectiveBroadcast', function (event, args) {
            $scope.setDefaults();
        });

        $scope.setDefaults = function() {
            //Setting Default Value
            alert(JSON.stringify($scope.appSubs)); //Coming as undefined            
        };
    },
    templateUrl:"../template.html"
    };
});

自定义指令元素:

<temp-directive as-app-obj="asAppObj" as-app-subs="asAppSubs" />

现在，问题是，在尝试访问指令中默认方法中的隔离范围时，我得到了一个未定义的值，而数据正在传入并绑定到 DOM.如何访问广播侦听器中的隔离范围并修改指令模板 HTML?是否还有其他处理此问题的方法?

Now, the issue is that while trying to access the isolate scope in the default method inside directive, I aam getting an undefined value whereas the data is coming and is getting bound to the DOM. How can I access the isolate scope in the broadcast listener and modify the directive template HTML? Is there another wasy for handling this?

推荐答案

问题是:当时 angular 还没有更新它的绑定.

The problem is: at that time angular does not update its bindings yet.

你不应该像这样访问你的变量，尝试使用angular js绑定机制将它绑定到view(例如使用$watch).绑定到父作用域变量意味着您被动，只需监听更改并更新其他变量或>你的观点.这就是我们应该如何使用 angular.

You should not access your variables like this, try to use angular js binding mechanism to bind it to view (by using $watch for example). Binding to parent scope variables means you're passive, just listen for changes and update other variables or your view. That's how we should work with angular.

如果您仍然需要访问它.您可以尝试使用 $timeout

If you still need to access it. You could try a workaround using $timeout

$scope.setDefaults = function() {
    $timeout(function () {
        alert(JSON.stringify($scope.appSubs)); //Coming as undefined  
    },0);          
};

演示

最好使用 $watch

It's better to use $watch

 angular.module('ctrl', []).controller('TempCtrl', function ($scope, $location, $rootScope) {
         $scope.appSubscriptions = "Subscriptions";
         $scope.appObj = "Objs";
         $scope.showAppEditWindow = function () {
             //Binding the directive isolate scope objects with parent scope objects
             $scope.asAppObj = $scope.appObj;
             $scope.asAppSubs = $scope.appSubscriptions;

         };
     });

     angular.module('ctrl').directive('tempDirective', function () {
         return {
             restrict: 'E',
             replace: true,
             scope: {
                 appObj: '=asAppObj',
                 appSubs: '=asAppSubs'
             },
             link: function (scope, element, attrs) {

             },
             controller: function ($scope, $timeout) {
                 $scope.$watch("appSubs",function(newValue,OldValue,scope){
                     if (newValue){ 
                         alert(JSON.stringify(newValue)); 
                     }
                 });
             },
             template: "<div>{{appSubs}}</div>"
         };
     });

演示

通过使用 $watch，在这种情况下您不需要广播您的活动.

By using $watch, you don't need to broadcast your event in this case.

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